Apparatus for applying abrasive to belts, polishing wheels, or the like



J. S. PORTER April 23, 1935.

APPARATUS FOR APPLYING ABRASIVE TO BELTS, POLISHING WHEELS, OR THE LIKE Filed March 3, 1933 3 Sheets-Sheet 1 J. s. PORTXER April 23, 1935.

OR THE LIKE APPARATUS FOR APPLYING ABRASIVE TO BELTS, POLISHING WHEELS,

Filed March 5, 1953 5 Sheets-Sheet 2 I \\\\\\\\\\\\\\\\\\\\\\\\\\\\\v .\\\\\v April 23, 1935.

J. S. PORTER APPARATUS FOR APPLYING ABRASIVE TO BELTS POLISHING WHEELS OR THE LIKE Filed March 3, 1933 5 Sheets-Sheet 3 y l 2 Q2 2; am 02 Q:

Patented Apr. 23, 1935 1 UNITED STATES PATENT. oFFic BELTS, LIKE POLISHING WHEELS, OR THE Joseph S. Porter, New Haven, Conn., assignor to D. & H. Scovil, Incorporated, Higganum, Conm, a corporation of Connecticut Application March 3, 1933, Serial No. 659,541

13 Claims. (CI. 91-18) In making abrasive wheels or belts it is cus- -tomary to first apply glue to the surface of the wheel or belt which is to be covered with the abrasive, and then, prior to the drying of the glue, 6 the glued surface is presented to an abrasive in granular form, which is taken up by the glue and will be caused to adhere to the belt or wheel when the glue sets. The character and fineness of the abrasive used depends upon the character of the work for which the belt or wheel is to be employed, and it has been necessary to vary the consistency of the glue, depending upon the fineness of the abrasive.

In the past it has been customary to apply the glue by hand to the element which is to be covered with the abrasive, and in many instances, particularly in the case of wheels, the abrasive itself was applied by hand, in that the wheel was rolled in a trough containing the abrasive. The same method was employed when worn abrasive wheels were recoated with abrasive material. This process was naturally a tedious one as it required considerable time to apply the glue to the surface of the element by hand, and thereafter present it to the abrasive.

In my prior Patent No. 1,775,110, I have shown an apparatus for applying an abrasive to polishing wheels wherein the glue is applied by hand to the abrasive wheel, which is thereafter moved into contact with a traveling belt containing the abrasive. This apparatus was a great improvement over the prior hand methods of performing this operation. The present invention, however, relates to a further improvement, in that, according to the present method and apparatus for performing it, the application of the glue as well as the application of the abrasive are machine opera.-

tions and may be carried out with a considerable Y saving of time and expense.

40 One object of the present invention is to provide a method of covering or recovering a belt or wheel with abrasive such that the operation may be performed speedily, and the abrasive may be applied to the glued surface before the glue has begun to set and while it is in proper condition to take up the abrasive and cause it to adhere tightly. v

Another object of the invention isthe provision of an apparatus for carrying out the method set forth above.

A still further object of the invention is the provision of an apparatus for supporting a belt or polishing wheel for applying a-coat of glue to the surface of the element which is to be covered with abrasive material, and thereafter coating the glued surface with the desired abrasive, the operations taking place in close sequence and being performed by the apparatus without .the necessity of removing the wheel or belt from its support between the operations of gluing and covering.

A still further object of the invention is to provide an apparatus for movably supporting an element to be covered withabrasive, effecting movement ofthe element beneath a glue dispenser so that it will receive a proper coating of glue upon the entire surface 'to be covered, and thereafter presenting the glued surface of the element to the abrasive so that all of the operations are performed by the apparatus, and, therefore, performed much more speedily and efliciently than when performed by hand.

Another object of the invention is to provide an apparatus wherein a glue container is arranged in a position spaced from a traveling belt designed to carry the abrasive, and between the container and belt is mounted a support for the element to be covered with abrasive, the support being arranged to move said element across the glue delivery means whereby its surface will be covered with the proper coating of glue and thereafter quickly present it to the abrasive-carrying element so that it will be moved by the latter to causethe abrasive to adhere to the entire glued surface.

To these and other ends, the invention consists in the novel features and combinations of parts to be hereinafter described and claimed.

In the drawings:

Fig. 1 is a front-elevational view of an apparatus embodying my improvements and designed to carry out my improved method;

Fig. 1A is a front elevational view of one end of the apparatus, this being a continuation of the view shown in Fig. 1;

Fig. 2 is a sectional view on line 2-2 of Fig. 1;

Fig. 3 is a sectional view on line 33 of Fig. 1;

Fig. 4 is a sectional view on line 4-4 of Fig. 1;

Fig. 5 is a partial side elevational view showing the glue container and associated parts;

Fig. 6 is a sectional view on line 6-6 of Fig. 5;

Fig. '7 is a sectional view of the adjusting mechanism for the work support;

Fig. 8 is a sectional view on line 8-4 of Fig. 1;

Fig. 9 is a detail front elevational view of the abrasive container and associated parts; and

Fig. 10 is a sectional view on line l0|0 of Fi 9.

.To illustrate a preferred embodiment of my invention, I have shown a frame I0 in which are mounted pulley shafts II and I2 carrying the pulleys I3 and I4, around which is trained an endless belt 13, the belt being maintained in taut position by the idler l3 rotatably mounted upon a shaft l1.

This shaft is carried by two arms l3 pivoted at l9, only one of which arms is shown in the drawings. The shaft may be adjusted to vary the position of the pulley by means of screw rods 33 which are loosely mounted in blocks 3| pivoted on the frame, and which rods are threaded in the ends of the shaft l1. It will be obvious that by turning the rods 33, the shaft II will be moved motor being provided with a pulley 24, around' which is trained a belt 23. This beltpasses around a pulley 33 fixed upon a shaft 31 mounted in bearings upon the frame II. This shaft, as shown more particularly in Fig. 22, carries a pinion 23 which meshes with a gear 33 secured upon the shaft ll of the pulley l3. The shaft l l projects from the frame at the rear side thereof, and a pulley" is secured upon its extended end. As shown particularly in Figs. 2 and 3, the frame It is open at the top thereof so that the belt l3, as shown in Figs. 2 and 3, travels along this opening so that its upper surface is exposed.

Rising from'the rear side of the frame [3 at an intermediate portion thereof are a pair of standards 32 upon which are secured guide plates 33 forming, in connection with the face of the standardaguideways 34 within which is slidably mounted a block or crosshead 33 so that this block is capable of a vertical sliding movement. As shown more particularly in Fig. 4, the block 33 is provided with a bearing 33 for a shaft 31, which shaft isdesigned to support the element to which the abrasive is to be applied. If this element be an abrasive wheel, the wheel to be covered is non-rotatably secured to the shaft 31. If, however, it is desired to apply abrasive to a belt, a pulley 33 is secured to the shaft 31 by means of the setscrew 33, as shown particularly in Fig.4 of the drawings, andthe belt 43 to be covered is trained about this pulley.

The shaft 31 is extended rearwardly of the bearing 33, and secured upon its rear end is a gear 4| which meshes with a gear 42 carried by a shaft 43 rotatably mounted in a block 44- secured to the sleeve of the bearing 33. Also secured to the shaft 43 is a pulley, and a belt 43 is trained about this pulley and also passes about the pulley 33 upon the shaft II, as shown in Fig. 2. It will be observed, therefore, that the shaft 21 is rotated by the motor 22 and in turn drives the shaft H, the pulley l3, and also the pulley 33, and through the belt 43 drives the pulley 45, the gears 42 and 4|, and the shaft 31 and pulley 33, provided that the block or crosshead 35 is raised to a sufficient height to hold the belt 43 taut. I

A rockshaft 43 is mounted in hearings in the side walls of the frame Hi, this rockshaft having secured thereto a crank 43 connected by a link 53 to the block 33, so that when the shaft 43 is rocked, this block may be raised and lowered in the ways 34. The raising and lowering of this block serves to raise or lower the shaft 31 and pulley 33 fixed thereon, so that the belt 43 to be covered by the abrasive may be lowered into contact with the belt l3 or raised out of contact with this belt.

As shown more particularly in Figs. 1, 2, 3 and '7, levers 3| and 32 are provided for rock ing the shaft 43, the former being designed to impart a sudden or abrupt movement to the shaft and the block 33, and the latter being designed to impart a slow or adjusting movement to the shaft and block. To eifect this result, the j shaft 43 is rotatably mounted at one end upon a shaft 33 which is rotatably mounted in a sleeve 34, which in-tum is rotatably mounted in a bearing 33 in the side wall of the standard l3. Lever 3| is secured to the sleeve 34, while lever 32 is secured upon the shaft 33.

Secured to the sleeve 34 is a collar 33 carrying a shaft 31, upon which is rotatably mounted a double gear having gear teeth 33 and 33. Gear 33isinmeshwithagear3lsecuredtotheshaft 1 43, while gear 33 is in mesh with a pinion 3| se-' cured to the shaft 33. Also secured to shaft 33 is an arm," from which projects a pin 33 engaging a brake band 34 which encircles a brake drum or pulley 33 secured-on the shaft 43.

It will be obvious that when the lever 33 is moved, the shaft 33 is rotated, which turns the gear 3! keyedupon thisshaft. This gearin turn effects rotation of the gears 33 and 33, the latter Y action of the shaft 43 is'eifected, which in turn results in a slow or adjustingmovement of the crank 43 and the block 33. During this movement the brake band 34 is moved by means of the arm- 33 secured upon the shaft 33, but as the brake is only frictionallv engaged with the brake drum or pulley 33, it will during this operation move or slip over the surface of this drum.

When the lever 3| is moved, the sleeve 34 will be rotated and through it the collar 33 which will tend to cause the gears 33 and '33 to revolve about the gears 33 and 3|. The resistance of the brake is, however, suiilcient to prevent such movement, and as a result the entire train of gearing will move as a unit, thus effecting rotation of the shaft 43 at exactly the same speed as the sleeve 34. In other words, this results in a direct movement of the shaft 43 by the lever 3| which effects an abrupt movement of the crank 43 and crosshead 33. Thus, it will be seen that a slow and fast movement of the block 33 is provided.

block I! having a backing roller 13 rotatably mounted therein. This backing roller lies below, and is designed to support, the belt l3 at the point of contact of the wheel or belt-which is to be covered by the abrasive. In other words, when the wheel or belt to be covered is lowered into contact with the belt l3, this contact will lie above, and the pressure be resisted by, the roller 13 carried upon the spring 31. The crank H may be rotated to turn the cam roller 33 and properly adjust the tension of this spring so that the necessary resistance will be offered by the roller I3.

As shown in Fig. 1, an abrasive container 14 is mounted above the standard It and above the run of the belt' It so that abrasive may drop from trolled y a gate 16 slidably, mounted u t ing held against. the outlet container, the gate opening by means screws 18 fixed in of springs 11 mounted upon the gate and passing through eyes 19 upon the container. The throw of the gate may bevaried by means of an adjusting screw 80 mounted in the gate and designed to contact with a fixed step ti on the container. The gate is operated by rock arms 82 connected at each side thereof, which arms are secured to a shaft I3 rockably mounted on the frame and having secured thereto at one end a friction disk 84, shown more especially in Fig. 10. I A clamping disk 85 is loosely mounted upon this shaft, and between the disks .4 and 88 is a third disk 86 having an arm 81 depending therefrom. It will be understood that the disk 80 is clamped frictionally between the disks l4 and It, so that while turning of the disk ID will normally eil'ect movement of the disk 84 and shaft 83, the disk It may slip by the disk It resistance to its movement.

- The arm 81 is pivoted at its lower end to a link 88, which in turn is pivoted at its lower end to an arm is secured to the collar". It will be recalled that this collar is moved by the lever 5| so that when this lever is moved in one direction, for example,the-direction.to move the block II v downwardly to presen the element to be covered ment of the disk 84 and shaft 83.

to full by abrasive to the belt II, the arm moved" in a direction to turn the shaft 83, to raise the gate 18, to uncover the container outlet and allow abrasive to run from the container upon the surface of the belt II. This movement will take place immediately upon the movement of the lever 5| so that the outlet opening will be uncovered to its fullest extent, determined by the adjusting of the screw ll. when this screw strikes the stop 8|, any fln'ther movement of the arm 81 will be ineffective as the rockshaft 83 will be prevented from turning and the disk It will slip upon the disk 84. Upon the return movement of the lever ll .in a position to raise the block 35, the initial part of this movement will eifect the closing of the outlet opening of the container, as the disk 86 ,will effect move- When the gate has been dropped, however, the disk 86 will slip upon the disk 84 and the lever II will be permitted to return to its original position without further movement of the gate 16. It will be obvious, therefore, that this provides in efiect a lost motion connection between the lever ii and the gate 16, whereby the gate will be moved at once open and closed positions upon the initial movement ofthe lever BI, and the lever will, thereafter, be permitted to move without having any effect upon the gate. By this means the supply of abrasive is always adequate whenever the element to be .covered is lowered into. contact with the belt 15, and, likewise, the flow of abrasive will be completely shut off when the covered element is raised from contact with the belt II.

A chute 89 is mounted on the frame l0 adjacent the pulley ll to convey excess abrasive material dropping from the belt I! to a suitable container (not shown).

A pair of rack bars 90 and 0| are'slidably mounted in the standards I2, these members having rack teeth 92 thereon which are engaged by pinions 93 secured upon a shaft 94 rotatably when the shaft encountersis beveled at one side.

81 will be.

mounted in the standards" and rockable by a lever 95. It will be apparent that movement of this lever will serve bars 02.

mine 96 which projects in a horizontal direction. and supported on this frame is a rod 81 the rod andbar projecting fo plate 88, this plate I 7 shown at I00, so as to embracethe rod l1.

Below this valve the passage II! is reduced in size,

. mouth is mounted a plate Ill containing either a narrow slot or a row of openings to pennit the egress of the glue when the valve I" is in the proper position. This plate is dovetailed or'beveled at its edges and rests in a cutaway portion of the base of the container, the edge-of which At the other side a pair of arms I08- are secured to the base by screws ill. and bear against the dovetailed edge of the plate to hold it in place and provide for its ready removal.

It will be apparent that the glue container secured to the plate 8! charge opening in the plate Ill overlies the work;

The handle I" may then be turned to open the glue to flow upon the work.

- It has already been may be used to coat I belts with abrasive, the work-supporting shaft or spindle 31 being designed either to receive the abrasive wheel, or, receive a pulley 38 to carry the endless belt. When abrasive wheels are being covered or recovered, it is only necessary to secure this wheel to the spindle 31, no cooperating means being required. when, however, .as shown in the drawings, the work to be covered consists of an endless belt, I secure to the bearing 30, an arm I" to support an idler pulley Ill over which the work or endless belt 4 0 is adapted to run. This pulley is provided with flanged sides, as shown at 2, so as to keep the work properly aligned with the outlet opening of the glue container.

In order to support the other end of the belt, a horizontally disposed frame 3 is secured to the frame I 0, and slidably supported upon the frame H3 is a standard H4 carrying a pulley Hi around which the belt 40 is trained. Connected to the standard H4 is a rod 6 secured at its other end to a lever I i 1, to which is secured a rod to a manually operable lever I.

may be op stated that my either wheels or endless to raise or lower the rack seeured to the upper end of these bars is a overlie the top-ofthe frame ll.

Slidably suppo n this rod andbar is-alo electric heating element may that movement of the rod ill to standard II4 to the right and tighten The lever II9 may be engaged with one of a series of rack teeth I20 to hold the standard Ill in the desired position.

While the operation of the device will be apparent from the foregoing description, it may be briefly described, as follows:

If it is desired to cover or recover an endless belt with abrasive material, the belt will be mounted upon the work-supporting pulley 38 and the idler pulley I I5 and trained over the flanged roller III. It will, of course, be understood that the desired abrasive has been placed in the abrasive container 14 and that the glue container contains a sufficient quantity of glue which is of the proper consistency and at the proper temperature to be applied to the belt. The glue container is then drawn outwardly over the belt from the position shown in Fig. 2 to that shown in Fig. 5, and the lever 5I is moved to the left, as shownin Fig. l to raise the block 35 and work-carrying spindle 31 to its upper position. The work, which in-this instance is an endless belt, during the application of the glue thereto travels with its upper surface in close proximity to the plate I08. If this is not the case when the lever 5I has been moved to the left, the adjusting lever 52 may be operated to effect a slow adjustment of the block 35 until the work is in proper relation to the glue discharge opening in the plate I00. This adjustment will, of course, be found particularly desirable in the case of covering abrasive wheels wherein wheels of different diameters are encountered, and, hence, need adjustment so that their surfaces will be in proper relation to the glue discharge outlet.

It will be understood that when the block 35 and work-carrying spindle are raised to their upper positions, as has just been explained, the belt 46 is rendered taut inasmuch as the pulley 45 is drawn upwardly with relation to the pulley 30- The motor is now put into operation with the result that rollers I3 and I4 are rotated to move the abrasive carrier belt I5, and likewise the pulley 38 is rotated to effect travel of the work or endless belt 40. The lever 5I being moved to the left, as shown in Fig. l, the gate 16 of the abrasive container is in its lower closed position.

With the work in motion, the handle I! is rotated to move the valve I06 to open position and allow the glue to flow from the container upon the work. The glue will be properly spread in a thin and even coating upon the work by the plate I00, and the operation is continued until the entire surface of the work has been covered. As this plate spreads the glue in an even and thin coat, and, moreover, does it so rapidly that the work will be completely coated before the glue has begun to set, there will be no lap or any thick coat of glue upon that portion of the work which may pass under the discharge outlet a second time. When this occurs, the coat of glue is simply spread out to its original thickness,

When the work has been completely covered with glue, the lever i is moved to the right to drop-tho work-carrying spindle 31 so that the work comes in contact with the upper surface of the belt I5. This contact will be at a point above the backing roller I3 so that the pressure of the work upon the belt will be resisted by this roller and the proper amount of pressure applied to cause the abrasive to be taken up by the glue to make an even coat. It will be understood that the belt I5 has been moving while the work is being coated with glue, but as the work is not in contaut, and the pulley 1,998,905 the belt. tact with the belt, and as the belt is carrying no abrasive at this time, the belt I5 will merely be running idly. When, however, the lever Si is moved tothe right to lower the work upon the belt IS, the gate 16 will be opened to allow the abrasive to flow from the container H upon the surface of the belt in a relatively wide but thin stream. When the work-carrying spindle 31 and block 35 is lowered, the belt 46 will no longer be will not be driven by this belt. Immediately, however, the work comes in contact with the belt I5 it will be driven by this belt at the same speed as the belt, so that during the process of covering the glued surface with the abrasive material, the work will no longer be driven positively but will merely be driven by contact with the abrasive-carrying belt.

I have ascertained that while it is advantageous to drive the work at the same speed as the abrasive-carrying belt during the operation of covering the glued surface with the abrasive material, it is also desirable to drive the work during the gluing operation at a higher speed than during the covering operation. This result is accomplished in a simple and expedient manner by my apparatus in that the work, when driven positively during the gluing operation, may, of course, be operated at any desired speed, and at the same time, when the work-carrying spindle is in its lower position, the positive drive is automatically stopped and the work thereafter driven at the-same surface speed as the abrasive carrier.

When the work has been completely covered with abrasive material, the motor is stopped and the work removed, and it may be placed in a suitable apparatus for drying. If desired, a second coat may later be applied.

The operation of the device when used to cover or recover an abrasive wheel is substantially the same as that described in case of a belt, as the wheel to be covered is merely secured to the work-carrying spindle 31 in place of the pulley 38. It will be found that with my apparatus, a coat of glue of uniform thickness may be applied to the work in a much shorter time than may be done by hand. Likewise, the coating of abrasive material may be applied to the work more quickly and more evenly than was formerly possible, and, moreover, the coating of abrasive will be of uniform thickness and its density may be regulated by the-pressure of the work upon the belt I5 as determined by the backing roller "and the lever 5|.

Difficulty has been experienced in the past particularly in coating endless belts where the gluing operation has been done by hand, in that, particularly in the case with relatively long belts, the glue will begin to set before the operation has been completed, and, hence, there is an objectionable lap at the point of the beginning and ending of the operation. Moreover, it has been impossible to satisfactorily glue relatively thin and cheap belts by hand, pos' sibly owing to the difiiculty of securing an even and uniform coat, which is secured by the use of my apparatus.

It has also been the custom to vary the consistency or thickness of the glue according to the size of grain of the.abrasive used. I am, however, able with my apparatus to use the same 'glue for coarse or fine abrasive, within wide limits. Regardless of the consistency of the glue, I am able to secure a uniform and even coat of the proper thickness over the entire surface of the work. The thickness of the coat of adhesive surface being joined to the remainder of the bar by inclined surfaces I21 and I28. When the container IUI is moved to the right from its position, shown in Fig. 5, the plate 99 upon which it is supported will ride upwar-Qy over the surface I26 so that the plate I08 will be carried over the frame 98 or over the edge of the pan I25. Thereafter the plate 99 will ride downwardly over the surface I28 so that the glue discharge opening through the plate I" will be immersed in the water in the water pan I25 and keep the glue in the discharge opening below the valve I06 in a soft condition.

In the covering of abrasive wheels, it is very often the custom to put two or three applications of abrasive to the wheel before it is ready for use, as sufllcient abrasive cannot be put on at one time. It is usual to apply one coat to the wheel and permit it to dry for a halfhour -or so, so that the adhesive will set to a certain extent before applying the following coat of adhesive and abraaive. If a third coat is to be applied, another interval is required following the second coat before the application of the third. I have found 'that when the abrasive is applied by machinery instead of by hand, it is possible to apply a second coat immediately after the first, and a third immediately afte the second without waiting for the preceding coat to set, and, of course, without removing the wheel from the wheel support. When the adhesive is applied by my. machine, it is flowed upon the work instead of being brushed thereon, as is the case with hand application. It, therefore, does not disturb the preceding coat, even when applied immediately. This is one decided advantage of my method and machine, in that several coats of adhesive and abrasive may be applied to a wheel successively without removing it from the machine, which will result in a considerable saving of time and expense.

While I have-shown and described a preferred embodiment of my invention, it will be under- I stood that it is not to be limited to all of the details shown, but is capableof modification and variation within the spirit of the invention and within the scope of the'appended claims.

What I claim is:

a 1. In an apparatus of the character described, a suitably supported adhesive container having a delivery outlet, a work-supporting member for supporting the surface of the work below said delivery outlet to receive adhesive therefrom,

means for moving the work while so supported,

an abrasive carrier mounted below the work support, means for delivering a supply of abrasive to said carrier, and means for moving said work support to present the work to said carrier to apply a coat of abrasive thereto.

'2. In an apparatus of the character described, a suitably supported adhesive container having a delivery outlet, 9. work-supporting member for supporting the surface of the work below said delivery outlet to receive adhesive therefrom, means for spreading the adhesive upon the work in aneven uniform coat, means for moving the work while so supported, an abrasive carrier mounted below the work support, means for delivering a supply of abrasive to said carrier, and means for moving said work support to present the work to said carrier to apply a coat of abrasive thereto.

3. In an apparatus of the character described, an endless belt, mechanism for imparting movement to the belt, means for depositing abrasive on the upper surface of the belt, a rotatable workholding spindle adapted to be moved toward and from the upper surface of the belt, means for applying a coat of adhesive to the work when supported on said spindle, and means for adjusting the spindle to bring the surface of the work in substantial contact with said adhesive-applying means.

4. In an apparatus of the character described, a work-supporting member, means for eifecting movement of the work when supported on said member, means for applying a coat of adhesive to the moving work, means for delivering a supply of abrasive to the adhesive-covered surface of the work without removing the latter from said support, and means for adjusting the surface of the work relative to said adhesive-applying means to control the thickness of the coat of adhesive applied thereto. v

5. A machine for applying abrasive to wheels, belts, or the like, comprising a suitably supported "adhesive container having a delivery outlet, a

traveling belt positioned below said outlet and spaced'therefrom, an abrasive container mounted in position to deliver abrasive upon said belt, a work-supporting spindle mounted above said belt, means for raising and lowering said work spindle to bring the work into and out of contact with the belt, and means actuated by said raising and lowering means to control the delivery of abrasive to said belt.

6. A machine for applying abrasive to wheels, belts, or the like, comprising a suitably supported adhesive container having a delivery outlet, a traveling belt positioned below said outlet and spaced therefrom, an abrasive container mounted in position to deliver abrasive upon said belt, a work-supporting spindle mounted above said belt, means for raising and lowering said work spindle to bring the work into and out of contact with the belt, and means actuated by said raising and lowering means to control the delivery of abrasive to said belt, said last-named means having a sliding connection with said raising and lowering means. 7. A machine for applyi .ig a coat of abrasive to abrasive wheels, endless belts, or the like, comprising an endless belt, mechanism for imparting movement to said belt, means for depositing abrasive on the upper surface of the belt, a workholding spindle supported above the belt and adapted to be moved toward and from the same, means to move said spindle toward said belt to cause the work to contact with the belt under pressure and means to regulate said pressin'e.

8..In a machine of the character described, a suitably supported abrasii e carrier, means for delivering a supply of abrasive to said carrier, a glue container supported above the carrier, a work spindle movably supported above the carrier and adapted to support the work below said glue container, means to move said spindle toward the glue container to present the work thereto and to move the spindle toward the abrasive carrier to effect contact of the work therewith under pressure, and spring-pressed means below said abrasive carrier-opposite the point of contact of the work therewith to resist such pressure.

9. Means for applying abrasive to an endless belt comprising a suitable supporting frame, a pair' of pulleys rotatably mounted on the frame about which the belt to be covered is adapted to be trained, means for driving one of said pulleys, adhesive delivering means arranged above said driven pulley to deliver a coat of glue upon the belt thereon, an abrasive carrier below the belt, and means to lower one of said pulleys to effect contact of the belt with said abrasive carrier.

10. An apparatus for applying a coat of abrasive to an endless belt comprising suitably supported pulleys for supporting the belt, means for driving one of said pulleys to efiect travel of the belt, means for spreading a coat of glue upon the surface of the belt while so supported, an abrasive carrier adjacent the belt, and means for moving the belt in contact with said carrier to apply a coat of abrasive to the glued belt.

11. In an apparatus of the character described, a suitably supported adhesive container having a delivery outlet, a work-supporting member for supporting the surface of the work below said delivery outlet to receive adhesive therefrom, means for driving the work when supported on said member, an abrasive carrier mounted below the work support, means for moving said work support to present the work to said carrier to apply a coat of abrasive thereto, and means for releasing the work from its driving means when the work support is moved to present the work to said carrier.

12. Means for covering endless belts or abrasive wheels with adhesive and covering the adhesivecoated work with an abrasive comprising an adhesive-applying means, an abrasive carrier, a support for the work movably mounted between said adhesive-applying means and the abrasive carrier, and said adhesive-applying means being movable toward and from the work support for the purpose described.

13. Means for applying a coat of abrasive to an endless belt comprising a plurality of supporting pulleys for the belt, an abrasive carrier comprising an endless belt, means for imparting movement to said carrier belt, means for depositing abrasive material on the upper surface of the carrier belt, and means for moving one of the supporting pulleys to cause said belts to travel in contact with each other to cover the first-named belt with the abrasive material.

JOSEPH S. PORTER. 

